19 results about "Cold shield" patented technology

The application discloses a cold shielding structure, a sample bearing unit and a method for using the cold shielding structure. The cold shielding structure comprises a cold shielding structure body, the cold shielding structure body comprises a mounting portion and heat sink portions located on opposite sides of the mounting portion, the mounting portion is used for mounting a carrier net, and the heat sink portions are used for guiding cold to the mounting portion. When the carrier net is mounted on the mounting portion, the temperature of the cold shielding structure body is lower than the temperature of the carrier net. Since the temperature of the heat sink portions is lower than the temperature of the mounting portion, the heat sink portions can absorb water molecules in an electron microscope barrel, so that the sample is prevented from being polluted by the water molecules. The thickness of the mounting portion is small, and the mounting portion is located between upper and lower pole shoes of the electron microscope, so that the distance between the upper and lower pole shoes of the electron microscope is reduced, the magnetic field intensity between the upper and lower pole shoes is increased, and the imaging resolution is ensured. Meanwhile, the heat sink portions with large thickness are located on the two sides of the mounting portion, so that the space between the upper and lower pole shoes is not occupied, the distance between the upper and lower pole shoes is further reduced, and the imaging resolution is ensured.

The present application relates to surface multilayer composite coating material reinforced heat conduction refrigeration type infrared detector Dewar nickel-based thin-wall cold shield and its preparation method, belong to refrigeration type infrared detector technical field. The method is that the nickel-based thin-wall cold shield with blackened inner surface is loaded into electron beam evaporation coating fixture; the electron beam evaporation coating equipment is pumped to high vacuum; when the vacuum degree of the electron beam evaporation coating equipment is greater than 1x10 ‑3 Pa, the surface of the thin-wall cold shield to be plated is baked at 200 DEG C; when the vacuum degree of the electron beam evaporation coating equipment is greater than 5x10 ‑4 Pa, the cold shield is cleaned by argon plasma; the nickel adhesion layer, copper heat conduction layer and silver heat conduction layer are plated on the surface of the cold shield in sequence; the present application does not significantly increase the heat mass of Dewar cold head on the basis of keeping the mechanical properties and thermodynamic properties of nickel-based thin-wall cold shield unchanged, can significantly enhance the heat conduction performance of the cold shield, speed up the heat transfer, and realize the rapid start of refrigeration type infrared detector.

The application relates to an arc-shaped superconducting magnet system for proton acceleration, which comprises an arc-shaped superconducting magnet, an ultralow-temperature system and a magnet suspension system, wherein the arc-shaped superconducting magnet comprises a dipole magnet, two quadrupole magnets and a magnet fastening structure; the ultralow-temperature system comprises a vacuum container, a cold shield structure, a liquid helium container, a gas return pipe, a refrigerating unit and a cold conducting structure; the magnet suspension system comprises a liquid helium container pull rod assembly and a cold shield structure pull rod assembly; the arc-shaped superconducting magnet provides a magnetic field required by proton acceleration, the ultralow-temperature system is used for providing a stable ultralow-temperature environment for the superconducting magnet, and the magnet suspension system keeps the arc-shaped superconducting magnet in a stable spatial physical position; the three are combined to form a complete arc-shaped superconducting magnet system suitable for proton acceleration; the application has the advantages of small volume, light mass, low operation cost, safer radiation protection and the like.

The application provides an online in-situ low-temperature high-pressure ultrafast spectroscopy device, a system and a method thereof. The high-pressure device comprises a cold shield with an optical window, a metal ring, a gasket, a first pressurized air bag, a second pressurized air bag, a pressurized metal column, a diamond anvil cell, a first temperature sensor, a second temperature sensor, a heat-conducting base, a cryostat and a gas pressure controller. The online in-situ pressure calibration and imaging system comprises a continuous light laser, the high-pressure device, online in-situ pressure optical components and an online in-situ pressure imaging system. The low-temperature high-pressure ultrafast pump-probe system comprises a femtosecond laser, the online in-situ pressure calibration and imaging system, pump-probe optical components and a pump-probe imaging system. The application realizes temperature regulation at 6-325K under high pressure with double air bag pressure regulation, realizes online in-situ free pressure regulation at low temperature, and realizes continuous regulation with an accuracy of 0.1GPa in the pressure range of 0-80GPa, and realizes online in-situ low-temperature high-pressure ultrafast spectroscopy and ultrafast dynamics measurement.

The invention discloses a supporting device for a cold shield plate of a star imitator, a cooling shield assembly and the star imitator, the supporting device comprises a supporting assembly and a cold shield plate mounting assembly which are detachably and fixedly connected, and the cold shield plate mounting assembly is fixedly connected to the cold shield plate. The supporting assembly comprises an expansion part and a supporting part, the supporting part is fixedly installed on one side of the container wall of the heat radiation container, the inner ring of the expansion part abuts against the outer wall face of the supporting part, and the outer ring of the expansion part abuts against the inner wall face of the cold shield plate installation assembly. The expansion component can abut against the supporting component and the cold shield plate mounting assembly and is in an expansion state, when the expansion component is in the expansion state, the inner ring of the expansion component deforms and abuts against the side, facing the outer wall face of the supporting component, of the inner ring, and the outer ring of the expansion component deforms and abuts against the side, facing the inner wall face of the cold shield plate mounting assembly, of the outer ring. The supporting device can stably and conveniently fix and support the cold shield plate on one side of the wall of the heat radiation container.

The application belongs to the technical field of mechanical manufacturing, and discloses a special-shaped cold screen suitable for a low-temperature refrigerator, which comprises an outer cover, a filter is arranged on the top of the outer cover, a cold head is arranged in the inner cavity of the outer cover, a special-shaped cold screen body and a sensor chip are fixedly installed on the top surface of the cold head, a vacuum cover is arranged at the lower end of the outer cover, an air extraction interface is arranged at the lower end of the vacuum cover, and a flange and a lead ring are fixedly installed in sequence at the upper end of the outer wall of the outer cover. Through cooperation of the cold head, the sensor chip and other structures, the special-shaped cold screen is directly fixed on the cold head of the low-temperature refrigerator, part of cold energy is conducted to the special-shaped cold screen through heat transfer, the temperature of the special-shaped cold screen is reduced, the signal interference of thermal radiation on the sensor chip is reduced, the black body on the inner surface of the shell absorbs stray radiation energy reflected from the surface of the sensor chip, and the influence of stray radiation energy on the signal of the sensor chip is reduced.

This invention provides a split-type cold screen for an infrared detector and its assembly method. The split-type cold screen for the infrared detector includes a cold screen body and matte fins. The assembly method includes: applying a black coating to both the cold screen body and the matte fins, pre-baking them, then initially assembling the pre-baked cold screen body and the matte fins, and finally baking the pre-assembled cold screen to complete the assembly. This invention places the cold screen assembly step after pre-baking and before baking, using the bonding force of the black coating to connect the cold screen body and the matte fins. This eliminates the adhesive bonding step in the split-type cold screen assembly process, solving the problem of using adhesives to bond the cold screen body and matte fins in the split-type cold screen assembly process. This ensures good mechanical reliability of the cold screen assembly in low-temperature vibration environments and also improves the performance of the detector components and the efficiency of the cold screen assembly process.

The invention relates to a cold shield structure with a secondary cooling function and a low-temperature liquid pressure container, and belongs to the technical field of low-temperature liquid pressure containers. The cold shield structure is arranged in a vacuum heat insulation layer space between a shell and an inner container of the low-temperature liquid pressure container and comprises a first cold shield arranged on the outer surface of the inner container in a sleeving mode and a primary cooling pipeline, and an inlet of the primary cooling pipeline is communicated with low-temperature liquid in the inner container. The second cold screen is arranged on the outer surface of the first cold screen in a sleeving mode, and an air inlet of the vortex generator is connected with an outlet of the primary cooling pipeline through an air inlet pipe; an inlet of the secondary cooling pipeline is connected with a cold air exhaust pipe of the vortex generator through an air outlet pipe, and an outlet of the secondary cooling pipeline is communicated with the external environment or a low-pressure pipeline. The double-layer cold shield structure forms two heat insulation barriers in the vacuum space between the shell and the inner container, and radiation heat transfer between the inner barrel and the shell can be effectively reduced.

The present invenon relates to a single-photon detector (2000, 3000, 4000, 5000) comprising a package (1300) defining a closed volume (V), a cooler (1200, 1210), detecng means (1100), posioned within the closed volume (V) and configured to detect photons emied from an opcal fiber (1400), and a cold shield (2500, 3500), posioned within the closed volume (V), wherein the detecng means (1100) are posioned within the cold shield (2500, 3500).

The application discloses a support device for a cold shield plate of a star simulator, a cooling shield assembly and the star simulator. The support device comprises a support assembly and a cold shield plate mounting assembly which are detachably fixedly connected, and the cold shield plate mounting assembly is fixedly connected to the cold shield plate. The support assembly comprises an expansion component and a support component, the support component is fixedly installed on one side of a wall of a heat radiation container, the inner ring of the expansion component abuts against the outer wall surface of the support component, and the outer ring abuts against the inner wall surface of the cold shield plate mounting assembly. The expansion component can be tightly abutted against the support component and the cold shield plate mounting assembly respectively and is in an expanded state. When the expansion component is in the expanded state, the inner ring of the expansion component deforms and tightly abuts against the outer wall surface of the support component, and the outer ring of the expansion component deforms and tightly abuts against the inner wall surface of the cold shield plate mounting assembly. The support device can stably and conveniently fix and support the cold shield plate on one side of the wall of the heat radiation container.

This invention discloses a high-vacuum low-temperature chamber, including a cavity, a sample stage located within the cavity, and further including a cold source module, a heat flow distribution module, a temperature equalization module, and a vacuum and cold shield module. The cold source module includes an external liquid nitrogen tank, a gas-liquid separation buffer tank, and a multi-channel solenoid valve array. The heat flow distribution module includes a multi-channel thermal diode, multiple thermal switches, and N temperature sensors for recording temperature response curves. Each channel of the multi-channel thermal diode is composed of a high thermal conductivity graphene film, with one end connected to the cold source and the other end connected to different areas of the sample stage. Each channel has a thermal switch based on a thermally induced phase change material. The temperature equalization module uses a high thermal conductivity graphite plate to ensure that heat can rapidly diffuse laterally once it enters the sample stage. The vacuum and cold shield module is a heatable regenerable cold shield with independent temperature control. Through online identification and rolling optimization, accurate tracking of the temperature trajectory is achieved without repeated manual parameter tuning, and it has adaptive capabilities.

The invention relates to the technical field of ultralow-temperature vacuum pumps, and particularly discloses a modularized anti-radiation ultralow-temperature vacuum pump suitable for deep space exploration, which comprises a pump shell, a first end plate is arranged at one end of the pump shell, a second end plate is arranged at the other end of the pump shell, and a radiation baffle is arranged in the pump shell through a connecting mechanism. An adsorption mechanism is arranged in the pump shell outside the radiation baffle and connected with the first end plate through a mounting mechanism, a cold shield is arranged in the pump shell on the side, away from the radiation baffle, of the adsorption mechanism, and a connecting shell is arranged between the first end plate and the second end plate and wraps the outer side of the pump shell. A protection mechanism is arranged between the connecting shell and the pump shell. By arranging a series of structures, the double-layer shell of the ultralow-temperature vacuum pump is provided with a protection structure, the pump shell has good internal protection performance, large-area cooling adsorption in the ultralow-temperature vacuum pump is uniform and balanced, and the adsorption mechanism is detachable, double-layer and good in sealing performance.

The utility model discloses a window sleeve for an infrared detector and infrared detection equipment, and relates to the technical field of refrigeration infrared detectors, and the window sleeve for the infrared detector comprises a window sleeve body, a window lens, a filter lens and a pressing ring. The top of the window sleeve body is provided with a first cavity used for installing a filter lens. The pressing ring is detachably connected with the window sleeve body, and the bottom of the pressing ring can stretch into the first cavity and is used for pressing the filter lens. The bottom of the first cavity is provided with a second cavity which is smaller than the first cavity in diameter and used for installing a window lens. The bottom of the second cavity is provided with a through hole which is smaller than the second cavity in diameter and penetrates through the bottom of the window sleeve body. According to the design, the size of the cold shield is saved, the heat mass of the Dewar body is reduced, and the working efficiency of the refrigerator is improved; meanwhile, the filter lenses in different spectral ranges can be flexibly replaced, and the application range of the detector is widened.

The invention discloses a method for testing dark current of a refrigeration type infrared detector, and relates to the technical field of performance testing of refrigeration type infrared detectors. The method comprises the following steps: step A, preparing a plurality of metal coatings on the surface of a prepared detector chip; step B, preparing a low blind cold shield; step C, packaging the chip; and step D, dark current testing is carried out, stability of a low-temperature environment of the assembly is guaranteed in the testing process, response signal values under short integration time and long integration time are tested respectively, and dark current calculation is completed. Compared with the prior art, the method has the beneficial effects that the metal coating is prepared on the surface of the detector chip, so that heat radiation irradiated on the surface of the chip is efficiently shielded, the metal shielding layer can keep the same temperature as the chip, and the metal shielding layer does not generate any heat radiation; the ultra-low dark current of the short-wave tellurium-cadmium-mercury infrared detector chip is tested more accurately, and the process method is simple and easy to implement and is compatible with an existing infrared detector dark current testing method.

A panoramic Mid-Wavelength Infrared (MWIR) lens has a plurality of optical elements, wherein each optical element from the plurality of elements is formed from a material that transmits in at least the MWIR band from 3 μm to 5 μm. The plurality of optical element are arranged in a manner that provides a 360 degree azimuth angle and an elevation angle that is within + / −20° from a 90° horizon. The panoramic MWIR lens is configured to be connected to a cooled Dewar, wherein the Dewar includes a cold shield and an image plane to detect light in the MWIR band transmitted through the plurality of optical elements.

A kind of for stellarator vacuum chamber block type cold shield assembly and vacuum chamber cold shield, belong to the technical field of magnetic confinement nuclear fusion equipment.The present application includes vacuum chamber body, and the outer wall of vacuum chamber body is provided with block type cooling assembly, and block type cooling assembly includes several cooling blocks, cooling block includes cooling panel, and the outer wall of cooling panel is distributed with groove, the inner wall of groove is fixedly connected with several serpentine cooling pipe, and the opposite side of several cooling panels with vacuum chamber body is all laid with MLI insulating material layer, through evenly arranged serpentine cooling pipe, can realize the heat exchange of whole area uniform, guide heat along the preset efficient path directional transmission, to quickly remove radiation heat, effectively improve the overall heat shielding efficiency, reduce the operating load of low-temperature system, eliminate local flow dead zone or short circuit phenomenon simultaneously, ensure the consistency and reliability of the entire annular cold shield surface cooling intensity.

The invention provides an infrared radiation scanning comparison and magnitude traceability system in a vacuum low-temperature environment, and the system is characterized in that a scanning mechanism, an optical system, a cold trap, a modulator, a diaphragm, a cold shield and an infrared detector assembly are all located in a stray radiation suppression system; the scanning mechanism is used for scanning a measured target; the calibration source is used for realizing calibration and value traceability in the measurement process of the radiometer; the optical system is used for converging infrared radiation of a measured target and projecting the infrared radiation to the modulator; the cold trap provides a measurement basis for the system; the diaphragm is located between the modulator and the infrared detector assembly, and the cold shield is located in front of the infrared detector assembly; and the lock-in amplifier processes and outputs signals to the data acquisition processing and control device according to the signals of the infrared detector assembly and the modulator. The technical problem that in the prior art, high-precision measurement and value traceability of the infrared radiation value under the high and low temperature environment condition cannot be achieved can be solved.

The application provides a low-temperature thermostat system for integrated mixture phase equilibrium data determination, comprising: a phase equilibrium system, including an adiabatic container, a cold shield, a heating kettle and a balance kettle; a vacuum system, vacuumizing the space inside the adiabatic container, the cold shield and the heating kettle; a vacuumizing and sample feeding system, vacuumizing the balance kettle and feeding the gas to be determined into the balance kettle; a temperature control system, including a cold shield heat exchange coil, a heating film and a liquid nitrogen supply device; a sampling and analysis system, including a sampling buffer and a gas chromatography analysis device; and a data acquisition system, recording the data of the phase equilibrium system, controlling parameters and obtaining the results of the sampling and analysis system. The low-temperature thermostat system for integrated mixture phase equilibrium data determination provided by the application can fully eliminate the influence of the gas medium on the temperature uniformity when data determination is performed, the temperature uniformity of the whole balance kettle internal space is kept accurate and good, the applicable temperature is in the range of-180-0 DEG C, and the pressure is in the range of 0-10 MPa, so the system is suitable for vapor-liquid phase equilibrium determination.

This invention relates to the field of fusion equipment technology and discloses a cryogenic pump, comprising: a housing having an inlet end and a mounting end arranged axially opposite each other, a cavity within the housing, an inlet at the inlet end, and a disassembly / removal port at the mounting end, both communicating with the cavity; an adsorption assembly detachably connected to the mounting end, the adsorption assembly covering the disassembly / removal port, the adsorption assembly being at least partially located within the cavity; a cold shield disposed between the adsorption assembly and the housing; a radiation baffle disposed between the cold shield and the adsorption assembly; a cooling pipe passing through the mounting end, the cooling pipe being connected to the cold shield and the radiation baffle; and a valve movably connected to the housing, the valve being able to cover the inlet, and the valve being suitable for being driven by a driving device outside the cavity. The cryogenic pump of this invention has a large adsorption area for its adsorption assembly, resulting in good adsorption effect and long service life.